<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator="/">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
      <!-- 添加角色按钮-->
      <el-row>
        <el-col>
          <el-button @click="showAddCateDialog" type="primary" plain>添加分类</el-button>
        </el-col>
      </el-row>
      <!-- 表格区域-->
      <tree-table
        :data="catelist"
        :columns="columns"
        :selection-type="false"
        :expand-type="false"
        show-index
        border
        class="treeTable"
      >
        <!-- 是否有效模板 -->
        <template slot="isok" slot-scope="scope">
          <i
            class="el-icon-success"
            v-if="scope.row.cat_deleted === false"
            style="color: lightgreen"
          ></i>
          <i class="el-icon-success" v-else style="color: red"></i>
        </template>
        <!-- 排序模板 -->
        <template slot="order" slot-scope="scope">
          <el-tag class="el-icon-primary" v-if="scope.row.cat_level === 0">一级</el-tag>
          <el-tag class="el-icon-success" v-if="scope.row.cat_level === 1">二级</el-tag>
          <el-tag class="el-icon-warning" v-if="scope.row.cat_level === 2">三级</el-tag>
        </template>
        <!-- 操作模板 -->
        <template slot="opt" slot-scope="scope">
          <el-button size="mini" type="warning" icon="el-icon-edit">编辑</el-button>
          <el-button size="mini" type="danger" icon="el-icon-delete">删除</el-button>
        </template>
      </tree-table>

      <!-- 分页区域 -->
      <el-pagination
        @size-change="handleSizeChange"
        @current-change="handleCurrentChange"
        :current-page="queryInfo.pagenum"
        :page-sizes="[1, 2, 5, 10, 15]"
        :page-size="queryInfo.pagesize"
        layout="total, sizes, prev, pager, next, jumper"
        :total="total"
      ></el-pagination>
    </el-card>

    <!-- 添加分类的对话框 -->
    <el-dialog title="添加分类" :visible.sync="addCateDialogVisible" width="50%" @close="addCateDialogClosed">
      <!-- 添加分类的表单-->
      <el-form
        :model="addCateForm"
        :rules="addCateFormRules"
        ref="addCateFormRef"
        label-width="100px"
      >
        <el-form-item label="分类名称：" prop="cat_name">
          <el-input v-model="addCateForm.cat_name"></el-input>
        </el-form-item>
        <el-form-item label="父级分类">
        <!-- options 指定数据源 props 指定配置对象 -->
          <el-cascader
            v-model="selectedKeys"
            expand-trigger="hover"
            :options="parentCateList"
            :props="cascaderProps"
            @change="parentCateChange" clearable change-on-select
          ></el-cascader>
        </el-form-item>
      </el-form>

      <span slot="footer" class="dialog-footer">
        <el-button @click="addCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addCate">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
import LoginVue from '../Login.vue'
export default {
  data() {
    return {
      //查询条件
      queryInfo: {
        type: 3,
        pagenum: 1,
        pagesize: 5
      },
      //商品分类列表
      catelist: [],
      total: 0,
      columns: [
        {
          label: '分类名称',
          prop: 'cat_name'
        },
        {
          label: '是否有效',
          type: 'template',
          template: 'isok'
        },
        {
          label: '排序',
          type: 'template',
          template: 'order'
        },
        {
          label: '操作',
          type: 'template',
          template: 'opt'
        }
      ],
      //控制添加分类对话框的显示与隐藏
      addCateDialogVisible: false,
      //添加分类的数据对象
      addCateForm: {
        //   分类名称
        cat_name: '',
        //父级分类id
        cat_id: 0,
        //分类等级 默认1级
        cat_level: 0
      },
      //添加分类的表单验证
      addCateFormRules: {
        cat_name: [
          { required: true, message: '请输入表单名称', trigger: 'blur' }
        ]
      },
      // 父级分类列表
      parentCateList: [],
      //指定级联选择器的配置对象
      cascaderProps: {
          value: 'cat_id',
          label: 'cat_name',
          children: 'children'
      },
      //选中的父级分类的Id数组
      selectedKeys: []
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    //获取商品分类数据
    async getCateList() {
      const { data: res } = await this.$http.get('categories', {
        params: this.queryInfo
      })
      if (res.meta.status !== 200)
        return this.$message.error('获取商品分类失败')
      //把数据列表 赋值给catelist
      this.catelist = res.data.result
      //获取总条数
      this.total = res.data.total
    },
    //监听pagesize改变事件
    handleSizeChange(newSize) {
      this.queryInfo.pagesize = newSize
      this.getCateList()
    },
    //监听pagenum改变事件
    handleCurrentChange(newPage) {
      this.queryInfo.pagenum = newPage
      this.getCateList()
    },
    //添加分类显示
    showAddCateDialog() {
      //获取父级列表
      this.getParentCateList()
      //展示对话框
      this.addCateDialogVisible = true
    },
    //获取父级分类数据列表
    async getParentCateList() {
      const { data: res } = await this.$http.get('categories', {
        params: { type: 2 }
      })
      if (res.meta.status !== 200)
        return this.$message.error('获取父级列表失败')
      this.parentCateList = res.data
    },
    // 选择项发生变化 触发该函数
    parentCateChange(){
        console.log(this.selectedKeys);
        //如果selectedKeys数组长度大于0 证明选中父级分类 否则没有选中
        if(this.selectedKeys.length > 0) {
            //找到父级分类
            this.addCateForm.cat_pid = this.selectedKeys[this.selectedKeys.length - 1]
            //得到当前所属的分类等级
            this.addCateForm.cat_level = this.selectedKeys.length

        } else {
           //找到父级分类
            this.addCateForm.cat_pid = 0
            //得到当前分类的等级
            this.addCateForm.cat_level = 0
        }
    },
    addCate() {
        this.$refs.addCateFormRef.validate(async valid => {
            if(!valid) return
            const {data: res} = await this.$http.post('categories', this.addCateForm)
            
            if(res.meta.status !== 201) {
                return this.$message.error('添加分类失败')
            }

            this.$message.success('添加成功')
            this.getCateList()
            this.addCateDialogVisible = false

        })
    },
    //监听添加分类对话框关闭事件，重置表单
    addCateDialogClosed() {
        this.$refs.addCateFormRef.resetFields()
        this.selectedKeys = []
        this.addCateForm.level = 0
        this.addCateForm.cat_pid = 0

    }
  }
}
</script>

<style lang="stylus" scoped>
.treeTable {
  margin-top: 15px;
}
.el-cascader 
    width: 100%

</style>